High
No code 260 on Worcester Bosch Greenstar 12i System

Your boiler is firing up, but the water inside is not getting any warmer, suggesting a blockage or a pump failure is stopping heat from moving around the system.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description

No temperature rise after burner starts

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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